Lennox Core Unit Controller User Manual

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Table 11. CORE Control System Alarm and Event Codes
SELECTED ALARMS (MARKED WITH * IN TABLE RESULT IN THE CLOSURE OF THE SERVICE RELAY CONTACTS (DO1).
ALARM
CODE
DISPLAY MESSAGE EVENT ACTION
5* BLOWER
Unitoff.Airowswitchisnormallyclosed.Monitoringstarts16secondsafterbloweris
started.ifairowswitchisdetectedopenafter16seconddelayperiod,allcompressors
are de-energized, gas valves closed, electric heat turned off, economizer damper closed,
and blower is stopped. Alarm will automatically clear once the error timed off delay has
expired and system will resume. Check blower operation.
6* FILTER
Dirtylterswitchisdetectedasclosedandwillautomaticallyclearonceswitchisdetected
open.ReplacelterorchecklterswitchS27.
7 ID
8* STRIKE 3 ON BLOWER
Lockout is active with multiple alarm code 5 detected. Alarm can be manually cleared
through the user interface. Check blower operation. Once problem is corrected, lockout
alarm can be cleared by resetting the CORE Unit Controller.
9 RESERVED
10 24VAC POWER LOSS TB35-1 24 VAC power loss at TB35-1 on A55 (M1) board. P111 pin 11.
11 24VAC POWER LOSS TB34-1 24 VAC power loss at TB34-1 on A55 (M1) board. P113 pin 1.
12 HIGH PRESS S4 OPEN COMP
Compressor is off. Check charge, fans and coil.
NOTE: On Ultra-High Efciency units - if only alarm 12 is present then issue could be high
temperature S5 switch. If alarm 12 is accompanied with alarm 14 then most likely
it is the high pressure S4 switch.
The unit controller will clear high pressure switch alarm when corresponding high pressure
switch is detected as closed. Compressor will not restart until corresponding high pressure
switch is closed and Minimum Off Delay (cooling or heating) has expired.
13*
STRIKE3 HIGH PRESS S4 OPEN
COMP
• Compressor is lockout. Check charge, fans and coil. Use service menu to clear
lockouts.
• User will be able to clear high pressure switch compressor lockout and alarm via user
interface. High pressure switch compressor lockout and alarm will be cleared after
the CORE Unit Controller reset.
• High pressure switch compressor lockout and alarm will be cleared on termination of
cooling demand.
• Default is 3 occurrences and can be set between 1 and 7 occurrences.
14 HIGH PRESS S7 OPEN COMP2
Compress is off. Check charge, fans or coil. This feature is not support in Model L at this
time.
NOTE: On Ultra-High efciency units tandem alarms (14) compressor 2 high temperature
S8 switch. If accompanied with alarm 15 then most likely the S4 high pressure
switch is the issue.
The CORE Unit Controller will clear high pressure switch alarm when corresponding
high pressure switch is detected as closed. Compressor will not be restarted until
corresponding high pressure switch is closed and Minimum Off Delay (cooling or heating)
has expired.
15*
STRIKE3 HIGH PRESS S7 OPEN
COMP2
• Compressor lockout. Check charge, fans and coil. Use service menu to clear
lockouts.
• User will be able to clear high pressure switch compressor lockout and alarm via user
interface. High pressure switch compressor lockout and alarm will be cleared after
the CORE Unit Controller reset.
• High pressure switch compressor lockout and alarm will be cleared on removal of
cooling demand.
• Default is 3 occurrences and can be set between 1 and 7 occurrences.
16 HIGH PRESS S28 OPEN COMP3
• Compressor is off. Check charge, fans and coil.
• The CORE Unit Controller will clear high pressure switch alarm when corresponding
high pressure switch is detected as closed. Compressor will not be restarted until
corresponding high pressure switch is closed and Minimum Off Delay (cooling or
heating) has expired.
17*
STRIKE3 HIGH PRESS S28 OPEN
COMP3
• Compressor lockout. Check charge, fans and coil. Use CORE Service application
RTU > SERVICE menu to clear lockouts.
• User will be able to clear high pressure switch compressor lockout and alarm through
the user interface. High pressure switch compressor lockout and alarm will be cleared
after the CORE Unit Controller reset.
• High pressure switch compressor lockout and alarm is cleared on removal of cooling
demand. Default is 3 occurrences and can be set between 1 and 7 occurrences.

Lennox Core Unit Controller Specifications

General

Brand	Lennox
Model	Core Unit Controller
Category	Controller
Language	English